Urna
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An Urna is a concave circular dot- an auspicious mark manifested by a whorl of white hair on the forehead between the eyebrows. It is often found on the 2nd and 3rd Century sculptures of the Buddha and Bodhisattvas. Sometimes it is represented with a jewel.
Urna is the 31st physical characteristic of Buddha. It symbolizes and radiates wisdom. It is also a symbol for a third eye, which represents the power to emit a beam of light and illuminate the world.